Fig. 6.

Abolition of cytoprotective action of CK against H₂O₂ by inhibition of HO-1 activity in ARPE-19 cells. Cells exposed to CK and/or ZnPP for 1 h were further stimulated with H₂O₂ for 24 h, and then flow cytometry with annexin V/PI dual staining was conducted. (A) Representative histograms and (B) quantitative analysis are shown. (C) Cell viability was examined for cells grown under the same conditions.